Question

what is critical velocity ?..plz explain in simple words!!​

Answer 1

Answer:

Critical velocity is the fastest speed at which a fluid can flow without any rapid movement in the flow or sudden waves or turbulence.

Answer 2

Critical velocity is the velocity (speed and direction) at which the flow of a liquid through a tube changes from laminar (smooth) to turbulent.

Calculating critical velocity depends on several variables. Reynold’s number (Re) characterizes the flow of the liquid through a tube as either laminar or turbulent. Reynold’s number is a dimensionless variable, which means it has no units attached to it.

OR

Critical velocity of a fluid is the velocity at which the liquid flow turns from streamlined to turbulent. When the velocity of a fluid in a pipe is less, the streamlines are straight parallel lines but as the velocity is gradually increased, the streamlines continue to be straight and parallel to the pipe wall until a velocity is reached that causes the streamlines to break and form patterns. Critical velocity disperses the streamlines randomly throughout the pipe.